Ruby is best known as the language behind the rails web application framework. However, it is a very flexible general purpose language that can be used for tasks of direct interest to R Developers (parsing files, interacting with databases, processing XML or JSON, math functions, statistics, machine learning, etc).

If you do not have root access on a Linux server, you may still be able to install the ruby language and rubgems. Start by checking the version currently installed (if any):

This error seems to be related to the MySQL-Bug #58406 (status: verified).

For the moment, you can ignore that message. The process skips the table and continues as always.
Whatever, if you want to make sure that your database has not been corrupted in consequence of this error, simply force mysqldump to ignore all performance_schema-tables.

All you need to do is access the terminal using the installation CD/DVD of your GNU/Linux operating system or to do the boot over network with RIPLinux. Once you are in the terminal, you will have to access the ‘grub’ shell to change the grub configuration: